docs: add NOWNodes as Unichain node provider

[NOWNodes]

Summary

Adds NOWNodes to the Unichain Node Providers page:

https://developers.uniswap.org/docs/unichain/tools/node-providers

NOWNodes provides API-key based access to Unichain JSON-RPC, WebSocket, Archive, and Trace/Debug endpoints for developers building wallets, dApps, analytics tools, and other Web3 services.

Type of change

• Fix (typo, broken link, incorrect or outdated content)
• New content (guide, page, code example)
• Update to existing content
• Other

How has this been verified?

Documentation-only change. Checked that the MDX formatting matches the existing provider sections and that the NOWNodes Unichain documentation link opens correctly:

https://docs.nownodes.io/unichain/

Applicable screenshots

N/A

Anything else reviewers should know?

NOWNodes currently lists Unichain Mainnet support, so the provider entry only includes Unichain Mainnet under supported networks.

[github-actions]

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[github-actions]

Flagging for human verification since this PR was submitted by the NOWNodes account itself: https://nownodes.io/nodes/unichain-uni and https://docs.nownodes.io/unichain/ are new external domains not referenced anywhere else in the docs. I wasn't able to fetch them in this sandboxed review session, so please manually confirm both links resolve and that NOWNodes does in fact support Unichain Mainnet JSON-RPC/Archive/Trace-Debug as described before merging.

Minor/non-blocking: the rest of this file is roughly alphabetical (Alchemy, Blockdaemon, Chainstack, dRPC, Dwellir, Infura, QuickNode, OnFinality), so "NOWNodes" would normally sort between Infura and OnFinality/QuickNode rather than at the very end — but since OnFinality/QuickNode are already out of order, this isn't a strict convention worth blocking on.

[github-actions]

Review summary

Small, well-scoped docs change: adds a NOWNodes entry to the Unichain Node Providers page, following the existing MDX structure (## provider heading, intro paragraph, ### Supported networks list) used by the other providers on this page.

Checked:

• MDX/frontmatter: unchanged and valid; new section uses the same heading levels and list formatting as neighboring sections (e.g. Dwellir, Alchemy).
• No contract addresses, chain IDs, or code samples touched.
• No other docs in this repo currently reference NOWNodes, so there's nothing to cross-check for consistency.
• Content reads as a factual, non-promotional provider listing, consistent with the rest of the page (this page's whole purpose is self-listed provider entries).

Flagged for human verification (left as inline comment): the PR adds two new external links (nownodes.io/nodes/unichain-uni, docs.nownodes.io/unichain/) from a first-time contributor who is the vendor itself. I couldn't fetch external URLs from this review sandbox, so please manually confirm both links resolve and that the claimed Unichain Mainnet JSON-RPC/Archive/Trace-Debug support is accurate before merging.

Non-blocking nit: the new entry is appended at the end of the file rather than in alphabetical order (minor — the file isn't strictly alphabetical already).

No other issues found.